What other pets should be avoided if you have a cat?

A friend of mine has always had fish and cats together and there has never been a problem. I've always had birds and cats together and never had a problem until I got the little Tonkinese devil cat! I have to keep the Quaker parrot locked up, which is a shame. It was used to being out of its cage until we got the Tonk. The Eclectus and Tonk are more of a match for each other. The Tonk has learned to be a little more respectful of that larger, more aggressive bird! They do sometimes fight over the heater in the bird's room. The Tonk doesn't have much fur to speak of & is usually cold so he loves laying on the heater in front of the cages. The Eclectus parrot gets territorial sometimes and will hang off his cage and lunge at the cat. The cat usually jumps down & walks away.